TI INA139NA/3K

INA139
INA169
SBOS181C – DECEMBER 2000 – REVISED JULY 2004
High-Side Measurement
CURRENT SHUNT MONITOR
FEATURES
DESCRIPTION
● COMPLETE UNIPOLAR HIGH-SIDE
CURRENT MEASUREMENT CIRCUIT
● WIDE SUPPLY AND COMMON-MODE RANGE
● INA139: 2.7V to 40V
● INA169: 2.7V to 60V
● INDEPENDENT SUPPLY AND INPUT COMMONMODE VOLTAGES
● SINGLE RESISTOR GAIN SET
● LOW QUIESCENT CURRENT (60µA typ)
● SOT23-5 PACKAGE
The INA139 and INA169 are high-side, unipolar, current
shunt monitors. Wide input common-mode voltage range,
high-speed, low quiescent current, and tiny SOT23 packaging enable use in a variety of applications.
Input common-mode and power-supply voltages are independent and can range from 2.7V to 40V for the INA139 and
2.7V to 60V for the INA169. Quiescent current is only 60µA,
which permits connecting the power supply to either side of
the current measurement shunt with minimal error.
The device converts a differential input voltage to a current
output. This current is converted back to a voltage with an
external load resistor that sets any gain from 1 to over 100.
Although designed for current shunt measurement, the circuit invites creative applications in measurement and level
shifting.
APPLICATIONS
● CURRENT SHUNT MEASUREMENT:
Automotive, Telephone, Computers
● PORTABLE AND BATTERY-BACKUP
SYSTEMS
● BATTERY CHARGERS
● POWER MANAGEMENT
● CELL PHONES
● PRECISION CURRENT SOURCE
Both the INA139 and INA169 are available in SOT23-5
packages and are specified for the –40°C to +85°C industrial
temperature range.
IS
RS
VIN+
Up to 60V
4
3
VIN+
VIN–
1kΩ
Load
1kΩ
V+
5
OUT
GND
2
VO = ISRSRL/1kΩ
1
RL
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
Copyright © 2000-2004, Texas Instruments Incorporated
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
www.ti.com
PACKAGE/ORDERING INFORMATION(1)
PACKAGE-LEAD
PACKAGE
DESIGNATOR
SPECIFIED
TEMPERATURE
RANGE
PACKAGE
MARKING
ORDERING
NUMBER
SOT23-5 Surface-Mount
DBV
–40°C to +85°C
E39
INA139NA/250
Tape and Reel, 250
"
"
"
"
INA139NA/3K
Tape and Reel, 3000
SOT23-5 Surface-Mount
DBV
–40°C to +85°C
A69
INA169NA/250
Tape and Reel, 250
"
"
"
"
INA169NA/3K
Tape and Reel, 3000
PRODUCT
INA139
"
INA169
"
TRANSPORT
MEDIA, QUANTITY
NOTE: (1) For the most current package and ordering information, see the Package Option Addendum located at the end of this data sheet.
ABSOLUTE MAXIMUM RATINGS(1)
Supply Voltage, V+
INA139 ............................................................................... –0.3V to 60V
INA169 ............................................................................... –0.3V to 75V
Analog Inputs, VIN+, VIN–
INA139
Common Mode ............................................................... –0.3V to 60V
Differential (VIN+) – (VIN–) .................................................. –40V to 2V
INA169
Common Mode ............................................................... –0.3V to 75V
Differential (VIN+) – (VIN–) .................................................. –40V to 2V
Analog Output, Out .............................................................. –0.3V to 40V
Operating Temperature .................................................. –55°C to +125°C
Storage Temperature ..................................................... –65°C to +125°C
Junction Temperature .................................................................... +150°C
Lead Temperature (soldering, 10s) ............................................... +300°C
ELECTROSTATIC
DISCHARGE SENSITIVITY
This integrated circuit can be damaged by ESD. Texas Instruments recommends that all integrated circuits be handled with
appropriate precautions. Failure to observe proper handling
and installation procedures can cause damage.
ESD damage can range from subtle performance degradation to complete device failure. Precision integrated circuits
may be more susceptible to damage because very small
parametric changes could cause the device not to meet its
published specifications.
NOTE: (1) Stresses above these ratings may cause permanent damage.
Exposure to absolute maximum conditions for extended periods may degrade
device reliability. These are stress ratings only, and functional operation of the
device at these or any other conditions beyond those specified is not implied.
PIN CONFIGURATION
Top View
2
SOT
OUT
1
GND
2
+
VIN
3
5
V+
4
–
VIN
INA139, INA169
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SBOS181C
ELECTRICAL CHARACTERISTICS
At TA = –40°C to +85°C, VS = 5V, VIN+ = 12V, and ROUT = 25kΩ, unless otherwise noted.
INA139NA
PARAMETER
CONDITION
INPUT
Full-Scale Sense Voltage
Common-Mode Input Range
Common-Mode Rejection
MIN
VSENSE = (VIN+) – (VIN–)
VIN+ = 2.7V to 40V, VSENSE = 50mV
VIN+ = 2.7V to 60V, VSENSE = 50mV
2.7
100
MAX
MIN
100
500
40
✽
TMIN to TMAX
V– = 2.7V to 40V, VSENSE = 50mV
V– = 2.7V to 60V, VSENSE = 50mV
±1
VSENSE = 10mV – 150mV
VSENSE = 100mV
VSENSE = 10mV to 150mV
VSENSE = 100mV
990
1000
10
±0.01
±0.5
1 || 5
1010
✽
±0.1
±2
Settling Time (0.1%)
NOISE
Output-Current Noise Density
Total Output-Current Noise
POWER SUPPLY
Operating Range, V+
Quiescent Current
UNITS
✽
✽
60
mV
V
dB
dB
mV
µV/°C
µV/V
µV/V
uA
120
✽
✽
✽
0.1
✽
10
✽
✽
✽
✽
✽
✽
✽
✽
(V+) – 0.9 (V+) – 1.2
VCM – 0.6 VCM – 1.0
FREQUENCY RESPONSE
Bandwidth
MAX
10
10
OUTPUT
Transconductance
vs Temperature
Nonlinearity Error
Total Output Error
Output Impedance
Voltage Output
Swing to Power Supply, V+
Swing to Common Mode, VCM
TYP
115
100
Input Bias Current
TEMPERATURE RANGE
Specification, TMIN to TMAX
Operating
Storage
Thermal Resistance
TYP
±0.2
1
0.5
Voltage(1)
Offset
RTI
vs Temperature
vs Power Supply, V+
INA169NA
✽
✽
✽
✽
µA/V
nA/°C
%
%
GΩ || pF
V
V
ROUT = 10kΩ
ROUT = 20kΩ
5V Step, ROUT = 10kΩ
5V Step, ROUT = 20kΩ
440
220
2.5
5.0
✽
✽
✽
✽
kHz
kHz
µs
µs
BW = 100kHz
20
7
✽
✽
pA/√Hz
nA RMS
2.7
VSENSE = 0, IO = 0
60
–40
–55
–65
θJA
200
40
125
✽
85
125
150
✽
✽
✽
✽
✽
60
✽
V
µA
✽
✽
✽
°C
°C
°C
°C/W
✽ Specification same as for the INA139NA.
NOTE: (1) Defined as the amount of input voltage, VSENSE, to drive the output to zero.
INA139, INA169
SBOS181C
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3
TYPICAL CHARACTERISTICS
At TA = +25°C, V+ = 5V, VIN+ = 12V, and RL = 25kΩ, unless otherwise noted.
COMMON-MODE REJECTION vs FREQUENCY
GAIN vs FREQUENCY
40
120
Common-Mode Rejection (dB)
RL = 100kΩ
30
RL = 10kΩ
Gain (dB)
20
10
RL = 1kΩ
0
–10
–20
G = 100
100
80
G = 10
60
G=1
40
20
0
100
10k
1k
100k
10M
1M
0.1
10
1
Frequency (Hz)
POWER-SUPPLY REJECTION vs FREQUENCY
10k
1k
100k
TOTAL OUTPUT ERROR vs VIN
140
5
VIN = (VIN+ − VIN−)
–55°C
Total Output Error (%)
120
G = 100
100
PSR (dB)
100
Frequency (Hz)
G = 10
80
G=1
60
0
+150°C
–5
+25°C
–10
40
–15
20
1
100
10
1k
100k
10k
0
25
50
Frequency (Hz)
125
150
200
QUIESCENT CURRENT
vs POWER-SUPPLY VOLTAGE
100
2
Output error is essentially
independent of both
V+ supply voltage and
input common-mode voltage.
1
Quiescent Current (µA)
Total Output Error (%)
100
VIN (mV)
TOTAL OUTPUT ERROR
vs POWER-SUPPLY VOLTAGE
G=1
0
G = 10
G = 25
–1
–2
+150°
80
+125°
+25°
60
–55°
40
20
Use the INA169 with
(V+) > 40V
0
0
10
20
30
40
50
60
0
70
Power-Supply Voltage (V)
4
75
10
20
30
40
50
60
70
Power-Supply Voltage (V)
INA139, INA169
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SBOS181C
TYPICAL CHARACTERISTICS (Cont.)
At TA = +25°C, V+ = 5V, VIN+ = 12V, and RL = 25kΩ, unless otherwise noted.
STEP RESPONSE
STEP RESPONSE
1.5V
1V
G = 100
G = 50
0.5V
0V
1V
2V
G = 100
G = 10
0V
0V
10µs/div
20µs/div
OPERATION
The transfer function for the INA139 is:
Figure 1 shows the basic circuit diagram for both the INA139
and the INA169. Load current, IS, is drawn from the supply,
VS, through the shunt resistor, RS. The voltage drop in the
shunt resistor, VS, is forced across RG1 by the internal op
amp, causing current to flow into the collector of Q1. The
external resistor, RL, converts the output current to a voltage,
VOUT, at the OUT pin.
IO = gm (VIN+) – (VIN–)
(1)
where gm = 1000µA/V
(2)
In the circuit of Figure 1, the input voltage, (VIN+) – (VIN–), is
equal to IS • RS and the output voltage, VOUT, is equal to
IO • RL. The transconductance, gm, of the INA139 is
1000µA/V. The complete transfer function for the current
measurement amplifier in this application is:
VOUT = (IS) (RS) (1000µA/V) (RL)
VP
Load Power Supply
+2.7V to 40V(1)
V+ power can be
common or
indepedent of
load supply.
Shunt
RS
VIN+
IS
VIN–
4
3
Load
V+
RG1
1kΩ
2.7V ≤ (V+) ≤ 40V(1)
(3)
RG2
1kΩ
5
Q1
VOLTAGE GAIN
EXACT RL (Ω)
NEAREST 1% RL (Ω)
1
1k
1k
2
2k
2k
5
5k
4.99k
10
10k
10k
20
20k
20k
50
50k
49k
100
100k
100k
INA139
2
OUT
1
+
IO
RL
VO
–
NOTE: (1) Maximum VP and V+ voltage is 60V with the INA169.
FIGURE 1. Basic Circuit Connections.
INA139, INA169
SBOS181C
www.ti.com
5
The maximum differential input voltage for accurate measurements is 0.5V, which produces a 500µA output current.
A differential input voltage of up to 2V will not cause damage.
Differential measurements (pins 3 and 4) must be unipolar
with a more-positive voltage applied to pin 3. If a morenegative voltage is applied to pin 3, the output current (IO) is
zero, but will not cause damage.
IS
3
4
INA139
BASIC CONNECTION
RL
Figure 1 shows the basic connection of the INA139. The
input pins, VIN+ and VIN– , must be connected as closely as
possible to the shunt resistor to minimize any resistance in
series with the shunt resistance. The output resistor, RL, is
shown connected between pin 1 and ground. Best accuracy
is achieved with the output voltage measured directly across
RL. This is especially important in high-current systems
where load current can flow in the ground connections,
affecting the measurement accuracy.
No power-supply bypass capacitors are required for stability
of the INA139. However, applications with noisy or highimpedance power supplies can require decoupling capacitors to reject power-supply noise; connect the bypass capacitors close to the device pins.
ZIN
OPA340
Buffer of amp drives the A/D converter
without affecting gain.
FIGURE 2. Buffering Output to Drive the A/D Converter.
OUTPUT VOLTAGE RANGE
The output of the INA139 is a current that is converted to a
voltage by the load resistor, RL. The output current remains
accurate within the compliance voltage range of the output
circuitry. The shunt voltage and the input common-mode and
power-supply voltages limit the maximum possible output
swing. The maximum output voltage compliance is limited by
the lower of the two equations below:
VOUT
MAX
= (V+) – 0.7V – (VIN+ – VIN–)
(4)
or
POWER SUPPLIES
VOUT
The input circuitry of the INA139 can accurately measure
beyond its power-supply voltage, V+. For example, the V+
power supply can be 5V whereas the load power-supply
voltage is up to +36V (or +60V with the INA169). However,
the output voltage range of the OUT terminal (pin 1) is limited
by the lesser of the two voltages (see the Output Voltage
Range section).
SELECTING RS AND RL
The value chosen for the shunt resistor, RS, depends on the
application and is a compromise between small-signal accuracy and maximum permissible voltage loss in the measurement line. High values of RS provide better accuracy at lower
currents by minimizing the effects of offset, whereas low
values of RS minimize voltage loss in the supply line. For most
applications, best performance is attained with an RS value
that provides a full-scale shunt voltage of 50mV to 100mV;
maximum input voltage for accurate measurements is 500mV.
RL is chosen to provide the desired full-scale output voltage.
The output impedance of the INA139 OUT terminal is very
high, which permits using values of RL up to 100kΩ with
excellent accuracy. The input impedance of any additional
circuitry at the output must be much higher than the value of
RL to avoid degrading accuracy.
Some Analog-to-Digital (A/D) converters have input impedances that will significantly affect measurement gain. The input
impedance of the A/D converter can be included as part of the
effective RL if its input can be modeled as a resistor to ground.
Alternatively, an op amp can be used to buffer the A/D
converter input, as shown in Figure 2, see Figure 1 for
recommended values of RL.
6
MAX
= (VIN–) – 0.5V
(5)
(whichever is lower)
BANDWIDTH
Measurement bandwidth is affected by the value of the load
resistor, RL. High gain produced by high values of RL will
yield a narrower measurement bandwidth (see the Typical
Characteristics). For widest possible bandwidth, keep the
capacitive load on the output to a minimum.
If bandwidth limiting (filtering) is desired, a capacitor can be
added to the output, as shown in Figure 3, which will not
cause instability.
3
4
f–3dB
INA139
1
f–3dB =
2πRLCL
VO
RL
CL
FIGURE 3. Output Filter.
APPLICATIONS
The INA139 is designed for current shunt measurement
circuits (see Figure 1), but its basic function is useful in a
wide range of circuitry. A creative engineer will find many
unforeseen uses in measurement and level shifting circuits.
A few ideas are illustrated in Figures 4 through 7.
INA139, INA169
www.ti.com
SBOS181C
3
4
3
VR
INA139
4
REF200
100µA
INA139
R1
VO
1
V+
VO
1
R2
RL
Gain Set by R1 R2
(V )R
Output Offset = R 2
R1 + R 2
Gain Set by RL
Output Offset = (100µA)(RL)
(independent of V+)
a) Using resistor divider.
b) Using current source.
FIGURE 4. Offsetting the Output Voltage.
±1A
Charger
1Ω
3
4
4
3
+
48V
+5V
1kΩ
1kΩ
1kΩ
+5V
1kΩ
5
Load
5
INA169
2
1
INA169
2
1
1N4148
Comparator
1N4148
SIGN
10KΩ
10KΩ
0V to 1V
VO
100KΩ
FIGURE 5. Bipolar Current Measurement.
INA139, INA169
SBOS181C
www.ti.com
7
RS
V+
4
3
4
3
+5V
+5V
+5V
5
REFOUT BUFIN
5
Digital
I/O
INA139
BUF
INA139
2
1
REF
BUFOUT
2
1
RL
25kΩ
MUX
RL
25kΩ
12-Bit
A/D
Converter
PGIA
Clock
Divider
Oscillator
Serial
I/O
ADS7870
The A/D converter is programmed for differential input.
Depending on the polarity of the current, one INA139 provides
an output voltage whereas the other’s output is zero.
FIGURE 6. Bipolar Current Measurement Using a Differential Input of the A/D Converter.
Other INA169s
Digital I/O on the ADS7870 provides power to
select the desired INA169. Diodes prevent
output current of an “on” INA169 from flowing
into an “off” INA169.
INA169
V+
+5V
––
REFOUT BUFIN
Digital
I/O
REF
BUFOUT
BUF
INA169
V+
––
MUX
12-Bit
A/D
Converter
PGIA
1N4148
RL
Clock
Divider
Oscillator
Serial
I/O
ADS7870
FIGURE 7. Multiplexed Measurement Using Logic Signal for Power.
8
INA139, INA169
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SBOS181C
PACKAGE OPTION ADDENDUM
www.ti.com
15-Jul-2004
PACKAGING INFORMATION
ORDERABLE DEVICE
STATUS(1)
PACKAGE TYPE
PACKAGE DRAWING
PINS
PACKAGE QTY
INA139NA/250
ACTIVE
SOP
DBV
5
250
3000
INA139NA/3K
ACTIVE
SOP
DBV
5
INA169NA/250
ACTIVE
SOP
DBV
5
250
INA169NA/3K
ACTIVE
SOP
DBV
5
3000
(1) The marketing status values are defined as follows:
ACTIVE: Product device recommended for new designs.
LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.
NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in
a new design.
PREVIEW: Device has been announced but is not in production. Samples may or may not be available.
OBSOLETE: TI has discontinued the production of the device.
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